(19)
(11) EP 0 266 301 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.07.1988 Bulletin 1988/28

(43) Date of publication A2:
04.05.1988 Bulletin 1988/18

(21) Application number: 87630216

(22) Date of filing: 29.10.1987
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 31.10.1986 US 925758

(71) Applicant: CARRIER CORPORATION
 ()

(72) Inventors:
  • Voorhis, Roger Joseph
     ()
  • Marris, Derrick Allen
     ()
  • Palmer, John Michael
     ()

   


(54) Refrigerant metering in a variable flow system


(57) In a refrigeration system having a compressor (14) driven by a variable speed motor (21), the refrigerant flow volume through the expansion device (25) is controlled by way of a solenoid driven piston (36) which alternately opens and closes the orifice (32), with the duty cycle of the solenoid (42) being controlled such that the time period in which the orifice (32) is open is proportional to the speed of the motor (21). A bypass channel (31) is provided in parallel around the orifice (32) such that a minimal flow is provided to thereby share the load with the modulating orifice (32) and act to dampen the movement of the solenoid piston (36).







Search report